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REVENUES (Disaggregation of Revenues) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 652,243 | $ 588,103 | $ 1,935,985 | $ 1,661,023
Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 650,750 | 587,369 | 1,930,085 | 1,659,526
Transferred at a point of time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,493 | 734 | 5,900 | 1,497
Time-and-material |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 559,133 | 507,649 | 1,675,172 | 1,451,813
Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 90,421 | 78,670 | 248,719 | 203,771
Licensing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,012 | 1,041 | 7,914 | 3,243
Other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 677 | 743 | 4,180 | 2,196
Business Information & Media |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 140,014 | 105,799 | 418,998 | 298,966
Financial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 136,715 | 130,337 | 396,333 | 364,003
Software & Hi-Tech |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 118,854 | 108,384 | 360,188 | 313,833
Travel & Consumer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 110,174 | 112,382 | 336,974 | 323,822
Life Sciences & Healthcare |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 74,203 | 66,769 | 212,326 | 180,741
Emerging Verticals |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 72,283 | 64,432 | 211,166 | 179,658
North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 389,976 | 358,401 | 1,161,742 | 1,009,841
Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 214,533 | 189,312 | 648,654 | 540,165
CIS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 30,039 | 26,501 | 76,977 | 69,766
APAC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 17,695 | 13,889 | 48,612 | 41,251
North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 391,605 | 358,987 | 1,167,536 | 1,000,701
North America | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 390,295 | 358,426 | 1,163,678 | 999,530
North America | Transferred at a point of time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,310 | 561 | 3,858 | 1,171
North America | Time-and-material |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 348,570 | 322,573 | 1,054,548 | 907,624
North America | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 41,050 | 35,273 | 106,760 | 89,694
North America | Licensing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,717 | 883 | 5,445 | 2,343
North America | Other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 268 | 258 | 783 | 1,040
North America | Business Information & Media |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 84,384 | 65,153 | 246,085 | 189,854
North America | Financial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 48,415 | 50,510 | 143,970 | 132,421
North America | Software & Hi-Tech |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 100,847 | 90,880 | 303,385 | 255,601
North America | Travel & Consumer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 54,590 | 51,476 | 161,507 | 146,654
North America | Life Sciences & Healthcare |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 66,071 | 60,049 | 189,458 | 164,492
North America | Emerging Verticals |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 37,298 | 40,919 | 123,131 | 111,679
North America | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 378,493 | 349,875 | 1,126,970 | 976,841
North America | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 11,278 | 6,756 | 32,805 | 16,722
North America | CIS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,433 | 2,349 | 6,223 | 6,093
North America | APAC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 401 | 7 | 1,538 | 1,045
Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 231,418 | 204,952 | 695,056 | 596,378
Europe | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 231,281 | 204,833 | 694,525 | 596,106
Europe | Transferred at a point of time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 137 | 119 | 531 | 272
Europe | Time-and-material |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 196,719 | 171,261 | 579,212 | 507,055
Europe | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 34,057 | 33,093 | 111,565 | 87,543
Europe | Licensing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 242 | 149 | 949 | 689
Europe | Other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 400 | 449 | 3,330 | 1,091
Europe | Business Information & Media |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 55,228 | 40,624 | 171,712 | 108,846
Europe | Financial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 68,419 | 61,067 | 202,668 | 181,781
Europe | Software & Hi-Tech |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 17,492 | 16,952 | 53,803 | 56,762
Europe | Travel & Consumer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 51,449 | 57,735 | 163,769 | 169,112
Europe | Life Sciences & Healthcare |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7,963 | 6,713 | 22,651 | 16,176
Europe | Emerging Verticals |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 30,867 | 21,861 | 80,453 | 63,701
Europe | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 10,853 | 8,484 | 32,107 | 32,926
Europe | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 203,255 | 182,533 | 615,843 | 523,180
Europe | CIS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 16 | 53 | 32 | 66
Europe | APAC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 17,294 | 13,882 | 47,074 | 40,206
Russia |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 29,220 | 24,164 | 73,393 | 63,944
Russia | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 29,174 | 24,110 | 71,882 | 63,890
Russia | Transferred at a point of time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 46 | 54 | 1,511 | 54
Russia | Time-and-material |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 13,844 | 13,815 | 41,412 | 37,134
Russia | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 15,314 | 10,304 | 30,394 | 26,534
Russia | Licensing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 53 | 9 | 1,520 | 211
Russia | Other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 9 | 36 | 67 | 65
Russia | Business Information & Media |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 402 | 22 | 1,201 | 266
Russia | Financial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 19,881 | 18,760 | 49,695 | 49,801
Russia | Software & Hi-Tech |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 515 | 552 | 3,000 | 1,470
Russia | Travel & Consumer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4,135 | 3,171 | 11,698 | 8,056
Russia | Life Sciences & Healthcare |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 169 | 7 | 217 | 73
Russia | Emerging Verticals |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4,118 | 1,652 | 7,582 | 4,278
Russia | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 630 | 42 | 2,665 | 74
Russia | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 23 | 6 | 263
Russia | CIS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 28,590 | 24,099 | 70,722 | 63,607
Russia | APAC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 0 | $ 0 | $ 0 | $ 0

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